Blowpipe



Patented Feb. 26, 1929.

UNITED STATES l 1,703,150 PATENT OFFICE.

JAMES B. ROSE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO TORCHPARTS GAS APPLIANCE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF DELAWARE.

"ammira Application l'ed August 15, `1927. Serial No. 212,895.

This invention relates to blowpipes, and more particularly to blowpipes that are used for the purpose of cutting metals with gases. It is the general object of the invention to provide a blowpipe of this character which is efficient in operation and which is simple in construction and economical of production.

A further object of the invention is to provide for blowpipes of this character a tip which can be made of copper and the parts of' which are so constructed that it may be provided, at comparatively low cost, with drilled passages for the preheating gases. Other -limited objects of the invention will appear hereinafter in connection with the detailed description which will be made with refereneeto the accompanying drawing, wherein Fig. 1 represents a side elevation of a blowpipe constructed in accordance with my invention; Fig. 2 a plan view of the said blowpipe; Fig. 3 a central vertical sectional view through the said blowpipe; Figs. 4, 5, 6 and 7 are details in section corresponding respectively to the lines 4*-4, 5-5, 6 6 and 7-7 j of Fig. 8; and Fig..8 a'plan view of the tip.

The blowpipe shown herein comprises generally a head A and a tip B with a shouldered nut C connecting the tip and head.

Assuming that the blowpipe is used in the .30 position shown in Figs. 1 and 3 of the drawing and describing the parts by reference to such positions, the head A comprises a horizontal portion A and a vertical portion A2; that is to sa the parts A and A2 are arranged as su stantially right angles to. each other. The part A is provided with an upper passage 1 for cutting oxygen, the oxygen being supplied to said passage by a tube 2.A At its front end, the passage 1 communicates with a vertical passage 1al arranged centrally within the part A2 of the head. The lower end of the passage 1n opens into a chamber within the lower portion A2 of the head. This chamber is provided with a truste-conical Wall As extending downwardly from the lower end of the passage la, with a cylindrical wall A4, and

a lower truste-conical Wall A5.

At its rear end, the part A of the head is widened and receives on opposite sides thereof the tubes 3 and 4, the former pipe conducting preheating oxygen to the rear of the head` and the latter pipe conducting combustible gas to the opposite side of the rear of the head. Mounted in a bore 5 in the lower portion of i5 the part A is an injector mixer, the said inof the surface 7a, the said shoulder being jector mixer comprising a tubular body 6 having an angular head 7 at the rear thereof and a cylindrical surface 7* in front of such angular portion, and a shoulder 7b in front adapted to engage the rear of the portion of the head surrounding the bore 5.

'.lhe injector body in front of the cylindrical part 7 is reduced in diameter to provide with the bore 5 an annular chamber 8, which annular chamber receives oxy en from a passage 9 which communicates wit a shallow chamber 10 into which the tube 3 extends. The oxygen supplied to the chamber 8 is delivered to the bore 6a of the injector through radial ports 11.

In front of the said radial ports, the injectorbody is threaded into a correspondingly threaded portion of the bore 5; and in front of such threaded portion, the diameter of the 75 injector is reduced to provide a second an- .nular chamber 12 which communicates with the bore of the injector by the radial ports 13. The chamber 12 receives combustible gas through a port 14 extending thereinto from the shallow chamber 15 with which the pipe 4 communicates. The front or delivery end of the bore 6a discharges into a chamber 5"l constituted by the front of the bore 5. From this chamber a passage 15at delivers the preheating mixture into the head chamber D below the wall A3.

Cooperating with the head just described is the tip, indicated generally at B. This tip comprises an outer member 1,6, an inner member 17, and a head member 18.

The inner member is provided at its upper end with a thread 19 by which it is secured in place within the head 18, the upper end of said inner member being rounded, as shown at 17a and fitting against a concave seat 18a formed within the head. The inner member has a bore 20 which registers with the bore 21 of the head. Beneath the threaded portion 19, the inner tip member-has op- 100 posite sides faced oi, as shown at 17h, thereby providing vertical passages between these portions and the surrounding outer tip member, which passages communicate at their upper ends with the chamber formed With- 105 in the sleeve 18b of the head 18. Below vthe portions 17", the member 17 is reduced in external diameter, as shown at 17 c, providing with the surrounding outer tip member an annular distributing chamber D from which 110 eoI - These passages are conveniently formed by of the inner member,

milling slots into the enlarged tapered end the correspondingly tapered portion 16""l of they outer member engaging the tapered portion of the inner member and thus converting the slots into passages.

The upper end of the outer member 16 is threaded into the bottom of the head 18. The operation of threading this member into the head causes its tapered lower end to be drawn into close engagement with the tapered lower end of the inner member..

The head 18 has the cylindrical sleeve 18b I at its lower end, a short cylindrical portion 18c thereabove, of greater diameter than the portion 18", and an upper cylindrical portion 18d of smaller diameter than either the parts 18h or' 18C. The part 18c is provided at its upper edge-with a tapered or frustoconical surface 18e adapted to engage the frusto-conical seat formed by the wall A5; and the upper cylindrical part 18d is provided with a frusto-conical portion 18f adapted to engage the frusto-conical seat formed by the wall A3. The shouldered nut C, hereinbefore referred to, serves to secure the tip to the head, said nut beingl threaded upon the lower threaded end of the head with its shoulder engaging the cylindrical projection 18. When the nut is set up, it forces the tapered surfaces on the head 18 into engagement with the tapered seats A8 and A5 within the blowpipe head, thus forming a tight and leak-proof joint.

The preheating mixture delivered through the passage 15 into the chamber D provided above the part 18c the vertical passages E by means of short ports 22 drilled through the portion of the head defined by the part r18c and so much of the part 18b as extends to the chamber formed in the bottom of the head for the reception of the outer tip member.

With the parts constructed and arranged as described, the operation will be easily understood. Oxygen supplied through the tube 3 and combustible gas supplied through the tube 4 are delivered to the injector, the oxygen entering through the ports 11 and the combustible gas through the ports 13. The

oxygen entering the bore of the injector exercises an aspirating effect upon the gas supplied through the ports 13 and the gases are mixed to some extent in the forward'end of the bore of the injector. as well as in the chamber 5, in the ports 15, and in the chamber D, as well as in their transit to the operating end of the torch. When the metal vshall havev beenV preheated ,by the preheating flames, cutting oxygen is turned on through the tube 2 and, passing downwardly through the passage 1a and the bores 21 and 20, will of the head is supplied to l serve to cut the metal in a well-known man- 4It is desirable that the tip should be formed of copper; and all three parts of the tip shown herein are made of that metal. It is also desirable that the drilled ports 22 shall be as short as possible,'in order to minimize the difiiculty and expense attendingthe drilling of long passages. This result is secured by the construction of the head.

The blowpipe described herein is extremely simple of construction and economical of production, but is, however, markedly eicient in operation.

Having thus described my invention, what claim is:

1. A blowpipe tip comprising a head having a reduced upper portion provided at the upper end thereof with a frusto-conical seating surface, saidhead also having a portion of greater diameter below the rst mentioned portion, the second portion having at its upper end a tapered or frusto-conical seating surface, the said head being provided with a reduced cylindrical portion extending.,T downwardly from the second portion and havingan internally threaded chamber in the bottom thereof and a central bore extending upwardly through the said head from the said chamber, the lower portion of the said bore being threaded, an inner tip member having a central bore and threaded into the bore in said head, and an outer tip member threaded inte the chamber provided in said head, there being passages provided between the inner and outertip members for preheating gases and there being passages exten-ding upwardly from the chamber in the said head ,through the second enlarged portion thereof and adapted to receive a preheating'mixture.

2. A blowpipe tip comprising a head having a chamber in the lower end thereof and a central bore extending upwardly therethrough from said chamber, the lower portion of the said -bore being threaded, an inner tip member threaded in said bore anditself having a bore therethrough registering with the upper portion of the bore in said head, an outer tip member threaded into the lower portion of the said chamber and forming passages for preheating gases with the inner tip member, the said head having vertically or longitudinally extending passages therein extending from the chamber provided in the lower portion of said head through a portion of the said head intermediate the top of said chamber and the top of the head.

3. A blowpipe tipv comprising a head having a reduced upper portion and a large'intermediate portion and a smaller depending portion, the last mentioned portion of the head being provided with a chamber projecting upwardly thereinto, the said chamber being internally threaded, the head having a bore extending therethrough from said chamber and the lower portion of the bore being enlarged and threaded, an inner ti member threaded into the lower portion o the said bore and having a bore adapted to register 5 with the upper portion of the bore in said head, an outer tip member threaded into the bottom of the chamber in said head and providing, with the inner member, passages for a preheating mixture communicating at their upper ends with the said chamber, the said head having one or more passages extending u Wardly from the chamber therein through tige top of the second portion thereof.

In testimony whereof, I hereunto ax my l signature.

Y JAMES R. ROSE. 

